How to recreate Oracle Inventory

$ export PATH=$PATH:$ORACLE_HOME/OPatch

$ opatch lsinv

Oracle Interim Patch Installer version 11.2.0.3.12

Copyright (c) 2016, Oracle Corporation.  All rights reserved.

Oracle Home       : /oracle/PROD/db/tech_st/11.2.0

Central Inventory : /oracle/oraInventory

   from           : /oracle/PROD/db/tech_st/11.2.0/oraInst.loc

OPatch version    : 11.2.0.3.12

OUI version       : 11.2.0.4.0

Log file location : /oracle/PROD/db/tech_st/11.2.0/Opatch/opatch2016-02-24_09-53-37AM_1.log

Lsinventory Output file location : /oracle/PROD/db/tech_st/11.2.0/cfgtoollogs/opatch/lsinv/lsinventory2016-02-24_09-53-37AM.txt

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Local Machine Information::

Hostname: bbarg-apps.ple.com

ARU platform id: 226

ARU platform description:: Linux x86-64

 Step2:$ cat ./oraInventory/ContentsXML/inventory.xml

           Check if your Oracle Home listed in the file if not go to next step.

     Step 3. Re-create the Oracle Inventory.
$./runInstaller -silent -attachHome ORACLE_HOME="<Your Oracle Home >" ORACLE_HOME_NAME="OraDbHome"

Now you can apply the patches successfully.

Regarda,
Bahaa Barghouti